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Outline
Recrystallization in directionally solidified columnar grain or single-crystal alloys significantly degraded alloy performance by introducing recrystallized grain boundaries perpendicular to the stress direction. Accordingly, recrystallization represented a critical concern during the manufacturing of aeroengine and gas-turbine blades. Serviceexposed directionally columnar grained blades were examined, and stresses induced at different production stages of blades were simulated to investigate recrystallization behavior during subsequent normalservice or slightlyovertemperature service conditions. The results showed that recrystallization occurred near the fillet between the blade airfoil and shroud, with a relatively large affected zone. Based on the size and number of recrystallized grains, recrystallized regions were categorized into two types: one consisted of one or several large recrystallized grains, while the other comprised numerous fine recrystallized grains. Analytical results showed that recrystallization had already formed inside the blades before service. Simulation results of directional solidification, machining and service processes for the alloy demonstrated that collisions during machining and handling, as well as uneven loading and excessive deformation during straightening, would cause plastic deformation of blades and further induce recrystallization during subsequent hightemperature heat treatment.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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